/*
<span id="cook">loading....</span>
<script language="javascript">
document.getElementById("cook").innerHTML="测试修改PAN里的值";
</script>
*/
<span id="cook">loading....</span><br />
<input id="b" type="button" value="按钮">
<script language="javascript">
document.getElementById("b").value="谢谢";
</script>
